No need to bleed the brakes. You can if you want to, but if all you are doing is changing pads, there is no need.
For the front brakes, simply compress the pistons, replace the pads and put them back on the car. Pump the brakes hard a few times to seat the pads and you should be good to go.
For the rear, you can't compress the piston. The parking brake is integrated so you need a tool to screw the rear piston in. That is the only want to compress is. WHen you are done compressing it, make sure the notches in the piston are at the 12 and 6 o'clock position and then replace the pad and put the caliper back on. Press the brakes hard and should be all set.